我想在div中移动图像，以便包含div的图像准确显示其大小

Question

function mov_left() {
    if (parseInt(document.getElementById('fold').style.left, 10) == 430) {
        clearInterval(animel);
    }
    document.getElementById('fold').style.left = (parseInt(document.getElementById('fold').style.left, 10) - 10) + 'px';
}

animel = setInterval('mov_left()', 100);

This is the code I'm trying to use to move a <div> containing 2 images so they can display the two images one at a time. However, the image just keeps moving to the left ignoring the if statement in the function.

Help please.

Answer 1

well I've fiddled with it, not really much change but I know this works:

function mov_left() {
    var el = document.getElementById('fold');
    if (parseInt(el.style.left, 10) == 430) {
        clearInterval(animel);
    }
    el.style.left = (parseInt(el.style.left, 10) - 10) + 'px';
}
animel = setInterval(function () {mov_left(); }, 100);

JSfiddle: http://jsfiddle.net/m7q3H/42/

Answer 2

如果未设置element的左css属性，则element.style.left将返回一个空字符串，而parseInt将返回NAN。